<!-- nav -->
<nav class="navbar navbar-expand navbar-dark bg-dark">
    <div class="navbar-nav">
        <a class="nav-item nav-link" routerLink="/0" routerLinkActive="active"
           [routerLinkActiveOptions]="{exact: true}">Start Here</a>
    </div>
</nav>

<!-- main app container -->
<div class="app-container" [ngClass]="{ 'bg-light': user }">
    <alert></alert>
    <router-outlet></router-outlet>
</div>